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IDS Forum

11.5 UC7E crashes

Posted By: KLAUS GLAHN
Date: Tuesday, 20 December 2011, at 2:06 p.m.

Hi,

we have an Informix Server 11.5 UC7E running under Debian Linux. The system ran fine in no-logging-mode for several years until we switch to logging-mode to support a new application.

Since then we experience crashes - the database dies with the following messages from the online.log:

18:09:34 Assert fehlgeschlagen: Bedingung nicht erfüllt (Bad block pointer 0x893fe2c in pool 0x28632028), In (mt_shm_free)
18:09:34 IBM Informix Dynamic Server Version 11.50.UC7E
18:09:34 Wer: Session(137915, hoffmann@tefix, 6734, 0x38e64e80)

Thread(141348, sqlexec, 3ede9f40, 1)

File: mtshpool.c Line: 4193
18:09:34 Aktion: Bitte informieren Sie die technische Unterstützung für IBM Informix.
18:09:34 stack trace for pid 8244 written to /opt/informix/tmp/af.2c0cc14d
18:09:34 Siehe auch: /opt/informix/tmp/af.2c0cc14d
18:09:36 Bedingung nicht erfüllt (Bad block pointer 0x893fe2c in pool 0x28632028), In (mt_shm_free)
18:09:36 stack trace for pid 8244 written to /opt/informix/tmp/af.2c0cc14d
18:09:36 Assert fehlgeschlagen: No Exception Handler
18:09:36 IBM Informix Dynamic Server Version 11.50.UC7E
18:09:36 Wer: Session(137915, hoffmann@tefix, 6734, 0x38e64e80)

Thread(141348, sqlexec, 3ede9f40, 1)

File: mtex.c Line: 491
18:09:36 Ergebnisse: Exception Caught. Type: MT_EX_OS, Context: mem
18:09:36 Aktion: Bitte informieren Sie die technische Unterstützung für IBM Informix.
18:09:36 Siehe auch: /opt/informix/tmp/af.2c0cc14d
18:09:38 Starting crash time check of:
18:09:38 1. memory block headers
18:09:38 2. stacks
18:09:38 Found bad memory block; address:29acfc88
18:09:38 mtex.c, line 491, thread 141348, proc id 8244, No Exception Handler.
18:09:39 Der Master-Dämon ist nicht mehr aktiv
18:09:39 PANIC: Attempting to bring system down

I am not an Informix expert, but responsible for the system. The internet is not helping with these error messages.

I don´t know if this is important or has anything to do with the problem, but we have this message regularly:
08:28:44 Contiguous shared memory segment allocation failed at 0xb78ee000.
Allocation successful at 0x43800000.
Check SHMBASE is consistent with the value in $INFORMIXDIR/etc/onconfig.std.
If you are using the correct SHMBASE value in your ONCONFIG file, then
consider this message informational only.
08:28:44 Dynamically allocated new virtual shared memory segment (size 8192KB)
08:28:44 Memory sizes:resident:1761624 KB, virtual:139872 KB, no SHMTOTAL limit

Short extract from our onconfig-file:
SHMBASE 0x44000000L
SHMVIRTSIZE 32656
SHMADD 8192
EXTSHMADD 8192
SHMTOTAL 0
SHMVIRT_ALLOCSEG 0.000000
SHMNOACCESS

Can anybody help me or can give me an advice how to solve this problem?
Or is anybody experiencing similiar problems?

Thanks for reading my long post :-)
Klaus

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